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If such a block is requested (more than 256 bytes), MM_MUL has to be specified in OS_Mop.
Remember If MM_MUL has not been specified, a "No Room" error means the pool is exhausted, and not the whole of memory. If a subsequent OS_Mop cannot allocate a pool, then memory is definitively exhausted.
The call WILL NOT automatically bind in the allocated memory into the Z80 address space.
Address of memory allocated (HL) is always adjusted to segment mask.
Normally memory is allocated from slots 1-2-3-0 in that order.
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